This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the Novel Coronavirus SARS-CoV-2, yellow, emerging from the surface of cells, blue/pink, cultured in the lab. Also known as 2019-nCoV, the virus causes COVID-19. Ontario is reporting three new cases of the novel coronavirus today, bringing the total in the province to 18. THE CANADIAN PRESS/AP-NIAID-RML via AP